Across the Continent – 1915 Before Interstate 80, before Highway 40, there was the Dutch Flat Donner Lake Wagon Road. Passing other traffic would have been a real problem, along with the livestock that was moved from winter to summer pastures along the route. Thanks go to Bill Oudegeest for figuring out the location just west of Big Bend at 39° 18.301'N 120° 31.579'W